Open-ILS/src/perlmods/lib/OpenILS/Application/Storage/Driver/Pg/fts.pm

   1 { # Every driver needs to provide a 'compile()' method to OpenILS::Application::Storage::FTS.
   2   # If that driver wants to support FTI, that is...
   3         #-------------------------------------------------------------------------------
   4         package OpenILS::Application::Storage::FTS;
   5         use OpenSRF::Utils::Logger qw/:level/;
   6         use Unicode::Normalize;
   7         my $log = 'OpenSRF::Utils::Logger';
   8
   9         sub compile {
  10                 my $self = shift;
  11                 my $class = shift;
  12                 my $term = NFD(shift());
  13
  14                 $log->debug("Raw term: $term",DEBUG);
  15                 $log->debug("Search class: $class",DEBUG);
  16
  17                 $term =~ s/\&//go;
  18                 $term =~ s/\|//go;
  19
  20                 $self = ref($self) || $self;
  21                 $self = bless {} => $self;
  22                 $self->{class} = $class;
  23
  24                 $term =~ s/(\pM+)//gos;
  25                 $term =~ s/(\b\.\b)//gos;
  26
  27                 # hack to normalize ratio-like strings
  28                 while ($term =~ /\b\d{1}:[, ]?\d+(?:[ ,]\d+[^:])+/o) {
  29                         $term = $` . join ('', split(/[, ]/, $&)) . $';
  30                 }
  31
  32                 $self->decompose($term);
  33
  34                 my $newterm = '';
  35                 $newterm = join('&', $self->words) if ($self->words);
  36
  37                 if (@{$self->nots}) {
  38                         $newterm = '('.$newterm.')&' if ($newterm);
  39                         $newterm .= '!('. join('|', $self->nots) . ')';
  40                 }
  41
  42                 $log->debug("Compiled term is [$newterm]", DEBUG);
  43                 $newterm = OpenILS::Application::Storage::Driver::Pg->quote($newterm);
  44                 $log->debug("Quoted term is [$newterm]", DEBUG);
  45
  46                 $self->{fts_query} = ["to_tsquery('$$self{class}',$newterm)"];
  47                 $self->{fts_query_nots} = [];
  48                 $self->{fts_op} = '@@';
  49                 $self->{text_col} = shift;
  50                 $self->{fts_col} = shift;
  51
  52                 return $self;
  53         }
  54
  55         sub sql_where_clause {
  56                 my $self = shift;
  57                 my $column = $self->fts_col;
  58                 my @output;
  59
  60                 my @ranks;
  61                 for my $fts ( $self->fts_query ) {
  62                         push @output, join(' ', $self->fts_col, $self->{fts_op}, $fts);
  63                         push @ranks, "ts_rank($column, $fts)";
  64                 }
  65                 $self->{fts_rank} = \@ranks;
  66
  67                 my $phrase_match = $self->sql_exact_phrase_match();
  68                 return join(' AND ', @output) . $phrase_match;
  69         }
  70
  71         sub sql_exact_phrase_match {
  72                 my $self = shift;
  73                 my $column = $self->text_col;
  74                 my $output = '';
  75                 for my $phrase ( $self->phrases ) {
  76                         $phrase =~ s/\*/\\*/go;
  77                         $phrase =~ s/\./\\./go;
  78                         $phrase =~ s/'/\\'/go;
  79                         $phrase =~ s/\s+/\\s+/go;
  80                         $log->debug("Adding phrase [$phrase] to the match list", DEBUG);
  81                         $output .= " AND $column ~* \$\$(^|\\W+)$phrase(\\W+|\$)\$\$";
  82                 }
  83                 $log->debug("Phrase list is [$output]", DEBUG);
  84                 return $output;
  85         }
  86
  87 }
  88
  89 1;